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Equations
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Proportions
Go Ahead Test Me!
% error
100
X eats twice as many bananas as Y.  Write an equation in terms of X to represent the relationship.
x = 2y
100
What is 2/7 as a percent?
29%
100
1/2 = x/4
x = 2
100
What is 10 percent more than 100 yards?
110 yards
100
Mrs. G measured her door at 95 inches.  The actual door was 96 inches.  To the nearest percent what was her percent error?
1 %
200
X eats twice as much cereal as Y.  Write an equation in terms of Y.
Y = 1/2x
200
John drank 3/5 of a jug of milk.  What percent is left?
40%
200
12/x = 6/3
x=6
200
A car is 180 inches long.  A truck is 75% longer.  How long is the truck?
315 inches long
200
Mr. Anderson measured the width of his floor at 135''.  It was actually 138''. To the nearest percent what was his percent error?
2%
300
Ben (B) runs 2/5 the distance of Tim (T).  Write an equation in terms of T to represent the relationship.
T = 5/2B
300

Tyler’s brother earns a commission. He makes 2.5% of the amount he sells. Last week, he sold

$900 worth of shoes. How much was his commission?

$22.50
300
19/27 = 47.5/x
x=67.5
300
A running track is 1/4 mile long.  Jim completes each lap in 1/20 of an hour.  What is his running speed?
5 miles per hour.
300
Jacob guessed that there were 945 jelly beans in the jar at the fair.  There were actually 843.  What was his percent error?
12%
400
Jim has a recipe for bread it takes 7.5 cups of flour to make 3 loaves of bread.  Write an equation in terms of bread.
B = 5/2F
400

The store bought a pair of shoes for $50, and sold it for $80. What percentage was the markup?

60%
400
A store is offering a 20% discount.  A pair of suspenders is marked down to a price of 18 dollars.  What was the original price of the shirt?
$22.50
400

Lin’s father is paying for a $20 meal. He has a 15%-off coupon for the meal. After the discount, a 7%

sales tax is applied.

What does Lin’s father pay for the meal?

$18.19
400
Diego measured his pencil at 22 cm.  The actual length is 23 cm.  What is his percent error to the nearest hundredth of a percent?
4.35%